Oil Palm Process
Oil Palm Process
The oil palms ( Elaeis ) comprise two species of the Arecaceae, or palm family. They are used in commercial agriculture in the production of palm oil. The African Oil Palm Elaeis guineensis is native to west Africa, occurring between Angola and Gambia, while the American Oil Palm Elaeis oleifera is native to tropical Central America and South America. The generic name is derived from the Greek for oil, elaion , while the species name refers to its country of origin.
Mature trees are single-stemmed, and grow to 20 m tall. The leaves are pinnate, and reach between 3-5 m long. A young tree produces about 30 leaves a year. Established trees over 10 years produce about 20 leaves a year. The flowers are produced in dense clusters; each individual flower is small, with three sepals and three petals.
The palm fruit takes five to six months to mature from pollination to maturity. Each fruit is made up of oily, fleshy outer layer (the pericarp), with a single seed (kernel), also rich in oil. When ripe, each bunch of fruit weigh 40-50 kilogrammes. The palm fruit is reddish, about the size of a large plum and grows in large bunches. Each fruit contains a single seed (the palm kernel) surrounded by a soft oily pulp.
Oil is extracted from both the pulp of the fruit (palm oil, an edible oil) and the kernel (palm kernel oil, used mainly for soap manufacture). For every 100 kilograms of fruit bunches, typically 22 kilograms of palm oil and 1.6 kilograms of palm kernel oil can be extracted.
The high oil yield of oil palm trees (as high as 7,250 liters per hectare per year) has made it a common cooking ingredient in southeast Asia and the tropical belt of Africa. Its increasing use in the commercial food industry in other parts of the world is buoyed by its cheaper pricing, the high oxidative stability of the refined product and high levels of natural antioxidants.
Since palm oil contains more saturated fats than canola oil, corn oil, linseed oil, soybean oil, safflower oil, and sunflower oil, it can withstand extreme deepfry heat and is resistant to oxidation.
Planting
For each hectare of oil palm, which is harvested year-round, the annual production averages 10 tonnes of fruit, which yields 3,000 kg of pericarp oil, and 750 kg of seed kernels, which yield 250 kg of high quality palm kernel oil as well as 500 kg of kernel meal. Palm fronds and kernel meal are processed for use as livestock feed.
All modern, commercial planting material consists of tenera palms or DxP hybrids, which are obtained by crossing thickshelled dura with shell-less pisifera. Although common commercial pregerminated seed is as thick-shelled as the dura mother tree, the resulting tree will produce thin-shelled tenera fruit. An alternative is to pre-germinated seed, once constraints to mass production are overcome, is tissue-cultured or “clonal” palms which provide “true copies” of high yielding DxP palms.
It is essential for an oil palm nursery to have an uninterrupted supply of clean water and topsoil which is both well-structured and sufficiently deep enough to accommodate three rounds of on-site bag-filling. Approximately 35ha can grow enough seedlings over a three-year period to plant a 5,000ha plantation. Pre-nursery seedlings must be watered daily. Whenever rainfall is less than 10 mm per day, irrigation is required, and the system must be capable of uniformly applying 6.5mm water per day.
Pre-nursery seedlings in the four-leaf stage of development (10 to 14 weeks after planting) are usually transplanted to the main nursery, after their gradual adjustment to full sunlight and rigid selection process. During culling, seedlings that have “grassy”, “crinkled”, “twisted”, or “rolled” leaves are discarded.
Weeds growing in the polybags must be carefully pulled out. Herbicides should not be used. Numerous insects (e.g., ants, armyworm, bagworm, aphids, thrips, mites, grasshoppers, mealybugs) and vertebrates (e.g., rats, squirrels, porcupine, wild boar, monkeys) are pests in oil palm nurseries and must be carefully identified before control measures are implemented.
After eight months in the nursery, normal healthy plants should be 0.8–1 m in height and display 5 to 8 functional leaves.
The proper approach to oil palm development begins with the establishment of leguminous cover plants, immediately following land clearing. It helps prevent soil erosion and surface run-off, improve soil structure and palm root development, increase the response to mineral fertilizer in later years, and reduce the danger of micronutrient deficiencies. Leguminous cover plants also help prevent outbreaks of Oryctes beetles, which nest in exposed decomposing vegetation. Both phosphorus and potassium fertilizers are needed to maximize the leguminous cover plants’ symbiotic nitrogen fixation potential of approximately 200 kg nitrogen/ha/yr and are applied to most soils at 115 to 300 kg phosphorous oxide/ha and 35 to 60 kg potassium oxide/ha. Young palms are severely set back where grasses are allowed to dominate the inter-row vegetation, particularly on poor soils where the correction of nutrient deficiencies is difficult and costly.
Crop nutrient
Nutrient uptake is low during the first year but increases steeply between year one and year three (when harvesting commences) and stabilizes around years five to six. Early applications of fertilizer, better planting material, more rigid culling has led to a dramatic increase in early yields in third to sixth years from planting. In regions without any serious drop in rainfall, yields of over 25 tonnes of fresh fruit bunches per hectare have been achieved in the second year of harvesting.
Nitrogen deficiency is usually associated with conditions of water-logging, heavy weed infestation and topsoil erosion. Symptoms are a general paling and stiffening of the pinnae which lose their glossy lustre. Extended deficiency will reduce the number of effective fruit bunches produced as well as the bunch size.
Phosphorous deficient leaves do not show specific symptoms but frond length, bunch size and trunk diameter are all reduced.
Potassium deficiency is very common and is the major yield constraint in sandy or peaty soils. The most frequent symptom is "confluent orange spotting". Pale green spots appear on the pinnae of older leaves; as the deficiency intensifies, the spots turn orange or reddish-orange and dessication sets in, starting from the tips and outer margins of the pinnae. Other symptoms are "orange blotch" and "mid-crown yellowing". In soils having a low water holding capacity (sands and peats) potassium deficiency can lead to a rapid, premature dessication of fronds.
Copper deficiency is common on deep peat soils and occurs also on very sandy soils. It appears initially as whitish yellow mottling of younger fronds. As the deficiency intensifies, yellow, mottled, inter-veinal stripes appear and rusty, brown spots develop on the distal end of leaflets. Affected fronds and leaflets are stunted and leaflets dry up. On sandy soils, palms recover rapidly after a basal application of 50 grams of copper sulphate. On peat soils, lasting correction of copper deficiency is difficult, as applied copper sulphate is rendered unavailable. A promising method to correct copper deficiency on peat soil is to mix copper sulphate with clay soil and to form tennis-ball sized “copper mudballs” that are placed around the palm and that provide a slow-release source of available copper.
Healthy, well selected seedlings are a pre-condition for early and sustained high yield. In most cases granular multinutrient compound fertilizers are the preferred nutrient source for seedlings in the nursery. Where sub-soil is used to fill the polybags, extra dressings of Kieserite may be required (10-15 g every 6 to 8 weeks). Where compound fertilizers are not available, equivalent quantities of straight materials should be used.
To maintain good fertilizer response and high yields in older palms (selective) thinning is often necessary.
Cross-breeding
Unlike other relatives, the oil palm trees do not produce offshoots; propagation is by sowing the seeds.
Before the Second World War, selection work had started in the Deli dura population in Malaya. Pollen was imported from Africa, and DxT and DxP crosses were made. Segregation of fruit forms in crosses made in the 1950s was often incorrect. In the absence of a good marker gene, there was no way of knowing whether control of pollination was adequate.
It was only after the work of Beirnaert and Vanderweyen (1941) that it became feasible to monitor the efficacy of controlled pollination. From 1963 until the introduction of weevils in 1982 contamination in Malaysia's commercial plantings was generally low. It appears that thrips, the main pollinating agent at that time, rarely gained access to bagged female inflorescences. However, E. kamerunicus is much more persistent, and after it was introduced D contamination became a significant problem. This problem appears to have persisted for
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